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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09b258c7f4e7dc723c5185ee099b2ee79a65cd6d0aee10862c719c78f5ba1d6' 
  AND token = '70rDktYPuHqbpqiNiaUELjX7Jd+lemQBkgMDGOKdLE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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