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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8bc964d8cb642814f4d22cbb4a545be5b4fbdc6835e3cf410f720214b74ca2' 
  AND token = '6Di2BrOfHy88ddYumZ54Gega7EVrjQAR4PbB0gZnGt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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