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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ea3ba24c5e3e7f237c3b46e976b92d19fa6d835ad2e7cbb5c3b92a6a9147b9' 
  AND token = 'OzBC56v0M95/8PHKU3Npz0yUVnl2MIP03s2qSMQLzBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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