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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8808f746af461f716c01cda33c28835e4b618cf74b162813e3a854e849ebbabd' 
  AND token = '08tMI9PT2sKwxWxGT/g5AoHSmNXiImh+QWPrzHi3rCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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