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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077a93b8c1c6b1a180bee5e550f74f04720ae41584c5c1f1da4f1d5ffba3e9b8' 
  AND token = 'IG8fSLoICDTA7YYMs9shtLAgjiqWTWTNKzldWwGP/lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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