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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8564fd14ada1d9edd54a94367c2886291181399b3c0b82335eb1a97785eb2e91' 
  AND token = '1AHtEA3u8H5iVb5BmYDk4GO+nnr3322n2t4RrsrxAuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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