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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492bd3ae5570b3bbac67d5e3c4b616f8a767e7f388e8f81d328c546a632c8ce0' 
  AND token = 'awIkCsABI5LqMdg8KFPwy9BQolNnds+yWIx1cmgJN0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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