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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10384d8d9dfc6459be7b6a815c0c07698ae2e471b9338d4fd2d216167cc21615' 
  AND token = 'gCTeWdHmS3HwmBidq62Q1AWSWxqsSxb4a+48InhRh/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}