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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475a1ca60b1a7d177de520eb62c8d781b2b560e6ff9a26f44af28e642c2147f3' 
  AND token = 'eZRktcVHd5inPA9SPsJTLQjhH2zNOAItetX2tNszyGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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