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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3545a98894d04394158fe3540ed2df3edcfce0be42c9d8abe0b7a3dfca46cc89' 
  AND token = 'OGlyGPaMar3F3K2Q24DcLJc+wr9Kq3Ohyi0hXJ9I1Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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