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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e0d5dfacbc682a2a8a7149f2e042c1d4c4350c897f025f6ef2d2ea26065ffc' 
  AND token = 'UxSGdbPMwTt1EkBVry/i7FFztc5u5gGgzRfOuNHm3Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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