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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db26b1363a34a0639027a3671886ac1e91dc58259f6b9e51481d1b915ff8053' 
  AND token = '+Dm6O8HqUnpNAScteVpWEFGsQNplwrdKStSoQBa05t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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