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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e0fee0e76b9840a5c186d9575b3c0b34c6dc16ec59cb5c8f79b3aaa679db2d' 
  AND token = '2dIQ5u0G+0fY33jfoqwcErZFsYsuloOanxxKMj2jVCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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