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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0418711776d69c964c826e9df38842d49b238a560abcc38eaf28d15a5216a7' 
  AND token = '0sHFAQHS3oPgaOsSB1uVawAuohx3g64FsJ2yNMzmT6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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