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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b40ca917980a1b3e314e2368d524818ca4920a333ad455abaa9ab121252ef83' 
  AND token = '22L8Lpp0/3jO7Xls1QBlGEvwkn0Zv4Bz08/XqVxsjEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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