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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0085027d4009ca3239e1956a22d20ef15b0d5af35899bc0ab45b5942543c85b6' 
  AND token = 'xHyF9OMIqQy4RREtOyD6XGJmd15LvZ2F+yHdYXIo2nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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