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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e796a1ac5454395c281db2f36abbd31c1f0ccfb5f60badaa1010a537782f788a' 
  AND token = 'C2tn8j4u4zbmbuEu/J651hqtNS23r1r829UwIz6Hw6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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