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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aef581e90c00af727506ed279bd183757be995ded5bdb3fe9eb8accef66b80d' 
  AND token = 'lbDY6+9JqE5YAs0yVstP8v4J3R0wF4IibpPng3djeHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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