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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2026cf46596e7c4769a14a40b679f44d482c5c1388c2cb0d24387877fd3b3975' 
  AND token = 'ox5IhPXRueNtn8TIKGnorEiilIfgyN1/lnEkv2Vbbaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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