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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28780fa47e3a7da2ed058336fb73b5ce312b2e6a834187218fd87fedf76ab19b' 
  AND token = '6L4+x6lXZCHM/JcmTqU4kV/CRE4m79ad1h/s116thZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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