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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9210627a3e25a7e6537214dde6046bb2b83a0e3ece74471f4a8c764de3c79153' 
  AND token = 'TCsh7gBublkg7jK/m3iPZcpcY1FPFLBxH+tB8787hI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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