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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcc90627dd0fdc4e5923839d2fa9c97967e1c08cf5ff58399b0db3101c33f0d' 
  AND token = '/XK6pYlX17JEVGYJcoHge9YcMtjqBIIGTDoLD7JEux0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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