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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2805d5e91c11c21ac332b1026cdc10e3ec3ced24be8e17e06aca0a6e1529ccd' 
  AND token = 'S+ML3NSVT88aTbraHF7p7qddQ2+eTtV/a9UE/La1IYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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