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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350cd9fc75d9f84ef1644f44359a9d84b2573013963f2327481ea4a87360e6c2' 
  AND token = 'xXW2X54+8AvAUIPaUO/BfFhR9F+Exkg7ymXEOALiLRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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