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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9128fd58db4e84c56aa491a5afb2825b377f41eee3ac104db646b38d3a84a6d' 
  AND token = 'n97VygvGouxDCH2MP8T4PW6p4O/Qw6WgZCqcvRe2Gok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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