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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6dff70364e18081bfd68628e1194e74f29b1841cfb9abc51ea0cd406fa83b6' 
  AND token = 'lc4PNAcD+r5T0X8Jqi7+pHC3x87N0ut+iQyf+kMH6yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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