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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f7c67f6c11758de8e0e9daa6874e89396eb1755034d98731153549aa5651e1' 
  AND token = 'aXc9WRpOZ6FAvTN2vwzMkd+0YbfmMAZayPv2Pvj06NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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