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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0c8d1a3cfaa41f80bc38ceb6e75b32fef3abf35e8e4ee3a69f5c3c56951996' 
  AND token = 'L31ZFyATiiabRp1Va5Dx6A/r9twtI9dOoUQ30LFFFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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