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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9f5540c1a48dd8c8238e3e85ba6f4032a1221e847acaa71cb809484020fce4' 
  AND token = 'lKYDxk9Z+TQZ141DS01tinI2q+3FNkiREp0bsDvLFBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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