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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cee40b4c1d5c68b2c05d2cb2abbd5ca970bfade34fb5a0cacc4c5bdfb7aa766' 
  AND token = 'ZsQgWAjO3D9Et72nAarTF1IBUuEjwEK56Z96qwoZ9Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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