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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6d13ca2fc198506de74b5f7c138321f51d2d86d9e4b7c8df06de32c7ab8c70' 
  AND token = 'J2dPU3BVYNG661gUHuf4l7bW+/P5fsPLTP+skMXbKYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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