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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a93afb5693796ec4b43b432ea6ee0414332a8da39f417757a5532aef6858c9' 
  AND token = '0oBqNR/JrHg2p8zhM1D5pTQ3/a6icDYv/RjkU8wfIUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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