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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4409b6934ba440fad0072675691aa3fc4c6722ff04e06b7fdda531bee83316f2' 
  AND token = '4SejS41o1SUZWjwyhvLhdKQ5f2hpd6g6CG1bFXiaZpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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