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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce285052c80a122513d21788db311fbd4df70ca05a4b80d598bd464ebd22b6ff' 
  AND token = '/iF/ixALGCmOBJ47iYot0sRWIBA5+yshfQ1AMrA++A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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