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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8664ab069f2d206144e7d333f299600daf55bd4bd416e8c0f744e36a140ab7e9' 
  AND token = 'y+YXFwtMgP8NUKgajQrR1CZqZiMwtl/d12E/RjjycPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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