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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e11d854d3c38144d5d5d45fcffbd37ebf1aabcd01f734a7a60afa77256d746' 
  AND token = '6GetIwf3Z/b4KX2QoEA3+MVsukwEbwgur37RBR4ERwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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