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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75994b3698d301dff9ded41ffeea62a12ddf2d26d568a60649474085c87b6ee9' 
  AND token = 'YSLYv9lL3Vg0EGpZbY9IkoXbEsDT1WwwWtX7sga3q4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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