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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0103071095822fe9488776ef7b2e8910a5181a8f54199a27d6561bbe4cc31ba0' 
  AND token = '5REM4W77gyGEBf2fAfNriBv/8OrmxgeeocadqwyTi0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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