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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571815f4ccba586bfdf3c5a5bdfd755b269c10bf7072494d71bda4e9a924c9b7' 
  AND token = 'YZHvcGhE1cpDfeB8u4W/lESM2iSutUVR3SbHy/XFFPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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