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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d0e4630c948a4746d048555f376b2526dd113ef7d5d93ac438c7c21e97e7a0' 
  AND token = 'cZY5dcuFXNb5be0xZzlNsaffKiJbNi99kkirvIMCIcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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