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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392f2a62490a37ee8bc2aaed058bbeb6ac812d0265452130c8785257da02058f' 
  AND token = 'vjD27ofADcMZp5e+wd0rtCU5/VgPc7+gGYHg1O4r+KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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