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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07d15913cf3a2a597da872153417f817e14531e9ca7d1d3e707d556946245f0' 
  AND token = 'pgd048AXZMiewcQYpV0CMfy/MPS6iTHxSEbIA7U8Aww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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