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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763c88192cb99b55d5e893a9928796809c699e2b59a3bc95a7687b3ec3504a22' 
  AND token = 'OkUVkVDQkBwSoNeEr75qZyyYZ8+DHJ67h/+BiAGfPZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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