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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c24256b4d415af74bdef9309f32981ad437cbf8eb08c66fcdb5702c1c7c6cb6' 
  AND token = 'SwNt2upU8M4kDlxRkcdrLUmppz5EEII2Ld5mZuZp0EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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