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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a5d8f997b0f1c0d1d659c14ba21f6a0f8d6d89ac9c1b500fdbc410f2e1fc36' 
  AND token = 'a9zJ1Tt9+tpzjThzomG73c5jOgK6y9GM6GSZW4J4U5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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