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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a7fd1c1ce581db6e341fec3b11aef084145daf9c75294b6be63ad696a5673f' 
  AND token = 'a6Jm3NFejTe07AZ7+PgslE+98j5WPvCGZ1+qEiAG40A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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