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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c69603915cb21962e516f001f4a8e3ff2a21e7dea927b47839bfd3ed0116d1c' 
  AND token = 'X4eBPNj20vCY+3YCmT/DlECRD6ARqiOCTvQ6VhgoO28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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