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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c0953edbdbeac3abfdbb19f103691bb6993d22f6c5391e6bad1394831884ba' 
  AND token = 'GoaHPPePMP4jfr6bHsQFRB0YRCYd4NRCf0GWERsIcNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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