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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a81f827a0f798f613b422ed5df3c91f1d880dfa77a200bdfdb1292b35e6f7b' 
  AND token = 'uHgGw1UNQMu9zTdK7QEb/6Q/Mdw3fe1J4jd7IuH/MSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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