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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f78ca870bbaee1a4d62ba20c3ccadfa47198c372ca4b559922a00c98615403' 
  AND token = '7uYbIYjG9sDz5zBmn4ZbB7L5RDk9fy9KORid2FLCiXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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