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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fe19de4145ab620b111b70c5f99ca27873da2e4634079500c52f9fdd2f7d2a' 
  AND token = 'Lt1R4pf8MrkdioxbjufkUvtxpMCfCOAqL3tP2MNxle4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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