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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdf3bcbcb87d25a6fb880cb9bb29b970855935f7ad34f9d6a6c040dd341385f' 
  AND token = 'KIg1hsb2+RfuKoruKahkSUCXmabtjgqeUn49B5oFTE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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