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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1246441508efca54da04274e185e1c9930b8f0fd11e8de3c62c3e1f3502cb8d5' 
  AND token = 'qmfiwSPaBuNNgoam0Gn1nzaKAO/eFUuy4yORJUl+l5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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