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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08c1ec754e4d664f2b755fb05c20aad9608b87e118b61da6b134c3eb5baf53d' 
  AND token = 'xRnbDtyfiQ0cY7pEc1V11KGxxa/F9WYNgDZPgwRlIL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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