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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1473904605ffd4dfc642f5fca3aa1db2ce1f946f2527dee499adab452d4a50dd' 
  AND token = 'dkhWz2rwY0K7Oy4xJkcNsONRe/lL0z5Ks3dEhk67sa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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