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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fb855edf9cb4d82ff2ad6e52361fdd8cf1d90e2fafa0ba53557a93999f7302' 
  AND token = 'NCCk2Xf0DV7M975Vm8yzN23iQc1+E/MGj/VTOohUvXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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