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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc011735d623f207568332c3573b0ee231a1f3c6136c5d8f4ed5f5c47f2cab4d' 
  AND token = 'EejCbLtcVIEjAFYiu1VIPQ4Vbhjw30aLq42JQZ/6jp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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