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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fe1b21cda58c601331698eb90d45692561ec0b9c1e3f2031f76307041dbc14' 
  AND token = 'OfDMB3b+dAXKC4rPLfPP22TID2I8uFljNf7bm2mXFcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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