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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ea55c277aef0611e0e87460e3d0a7b19ca2fd4e1dcc3f752877a8f17bd5f0b' 
  AND token = 'qCGvk/W/q1B5fT5Fd2UMRK4xx73yKveehrzMufZzroY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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