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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc42fbe6d3a3afb1ed05b862672f4093f71cbb1f627f08f918a98d5f418b466' 
  AND token = 'MVXX01wIEk2y4ms2PnacHlgF8ixFlU+/9/yon56jcEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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